I'm relieved that I'm not the only person experiencing this. I was thinking that my ISP was blocking it for some reason, despite having no such reason to do so... My paranoia gets the better of me sometimes.

Anyway, I use Chrome and I'm also getting slow loads and various timeouts, but even so, it's still a far better method than using the client, ATM.

Also the same problem here. Ubuntu 12.04 64bit, 32bit compatability also but with nVidia 310. It definitely seems to happen anywhere there is a long tooltip. It does not seem to happen with short tooltips. Maybe it is blocking whilst the tooltip is displaying and the length is related to the time the tooltip displays after mouseout.